Abstract
A transient calorimetric method of measuring the total hemispherical emittance of transparent materials in the temperature range 75°K to 312°K is described. Measured emittance values with an estimated accuracy of ±5% are presented for various thicknesses of NaCl and fused quartz. The emittance of NaCl decreased from 0.67 at 75°K to 0.34 at 312°K. The emittance of quartz was approximately constant at 0.73 over the same temperature range. Increasing the thickness of NaCl resulted in slight increases in emittance; no thickness effect was observed in the quartz. Total normal emissivity values calculated for NaCl from optical constants were not appreciably different from the measured total hemispherical emittances.
© 1967 Optical Society of America
Full Article | PDF ArticleMore Like This
E. R. Schleiger and L. A. Webb
Appl. Opt. 7(1) 33-35 (1968)
Hidetoshi Masuda and Mitsuo Higano
J. Opt. Soc. Am. A 2(11) 1877-1882 (1985)
E. R. Schleiger and L. A. Webb
Appl. Opt. 9(5) 1222_1-1223 (1970)